Quantum‑Mesh‑QEC v2 delivers a production‑grade, fault‑tolerant infrastructure that removes classical decoding from the qubit coherence window.

Layer 1 runs on a sub‑1µs hardware‑edge loop written in C99. It monitors indirect X/Z stabilizer parity on a 4‑neighbor ancilla grid, using branchless register selection to avoid branch penalties. By never observing primary data qubits, the module sidesteps wavefunction collapse while emitting error tokens in real time.

Layer 2 fuses JAX/XLA kernels and receives data through a zero‑copy pybind11 bridge. The AI core refines syndromes against a pre‑trained weight matrix and freezes back‑propagation when a hardware‑failure token appears, preventing noise from contaminating other sectors.

Layer 3 runs an asynchronous Python event loop that stays outside the active coherence window. It aggregates post‑facto error reports via PCIe/DMA, updates a global defect topology map, and triggers lattice surgery to permanently bypass failed nodes.

The three‑tier design eliminates the decoding latency wall, enabling real‑time quantum error correction in large‑scale superconducting qubit grids.